Lakeroadster's "Hammerhead Shark"

Discussion in 'Scratch Built' started by lakeroadster, Jan 29, 2020.

Help Support The Rocketry Forum by donating:

  1. Feb 11, 2020 #91

    John Kemker

    John Kemker

    John Kemker

    Forum Supporter TRF Supporter

    Joined:
    Aug 25, 2019
    Messages:
    404
    Likes Received:
    155
    Gender:
    Male
  2. Feb 11, 2020 #92

    kuririn

    kuririn

    kuririn

    BARGeezer TRF Supporter

    Joined:
    Oct 3, 2016
    Messages:
    3,129
    Likes Received:
    910
    Gender:
    Male
    Location:
    Hawaii
    Already looking forward to the finish
    62d1f226e8ac5a47576950bc00bad9e7--firebird-trans-am-car-decals.jpg
     
  3. Feb 11, 2020 #93

    lakeroadster

    lakeroadster

    lakeroadster

    Lone Wolf... No Club TRF Supporter

    Joined:
    Mar 3, 2018
    Messages:
    1,500
    Likes Received:
    405
    Gender:
    Male
    Location:
    Central Colorado
    Thanks for the suggestion.

    My concern. I have some old rolls of masking tape and their appearance make me nervous about using this technique. Not that I would use the old tape, the old rolls of masking tape are no longer smooth, they are wrinkled up. Long term, would this happen to the body tube? Also masking tape, by design, has a coating to give it the ability not to absorb paint, which makes me wonder just how well it will absorb CA, and how well it will adhere to the cardboard body tube.

    So as an alternative... how about using regular printer paper cut into strips and then use white glue, basically winding a 1/4" wide strip and making a DIY paper fiber centering ring? Similar to the method that folks use to make their own body tubes. Then everything would be paper based and thus wood fibers attaching to wood fibers.
     
    Last edited: Feb 11, 2020
  4. Feb 11, 2020 #94

    mbeels

    mbeels

    mbeels

    Putting the tree in rocketry TRF Supporter

    Joined:
    Feb 9, 2019
    Messages:
    1,307
    Likes Received:
    506
    Gender:
    Male
    That's a good idea, I think that there was an Apogee newsletter using this method for a 29mm centering ring in a BT-55 body tube.
     
    lakeroadster likes this.
  5. Feb 12, 2020 #95

    Greg Furtman

    Greg Furtman

    Greg Furtman

    Forum Supporter TRF Supporter

    Joined:
    Nov 10, 2018
    Messages:
    477
    Likes Received:
    179
    Gender:
    Male
    Location:
    Webster, Wisconsin
    It should be called Mjölnir. :D
     
  6. Feb 12, 2020 #96

    BABAR

    BABAR

    BABAR

    Builds Rockets for NASA TRF Lifetime Supporter TRF Supporter

    Joined:
    Aug 27, 2011
    Messages:
    4,780
    Likes Received:
    640
    For those (like me) without Baltic heritage

    [​IMG]
    Drawing of a Viking Age gilded silver Mjölnir pendant (length 4.6 cm) found at Bredsätra in Öland, Sweden, now kept in the Swedish Museum of National Antiquities
    In Norse mythology, Mjölnir (/ˈmjɔːlnɪər/;[1] Old Norse: Mjǫllnir, IPA: [ˈmjɔlːnir])[2] is the hammer of Thor, the Norse god associated with thunder. Mjölnir is depicted in Norse mythology as one of the most fearsome and powerful weapons in existence, capable of leveling mountains.[3][4][5] In its account of Norse mythology, the Prose Edda relates how the hammer's characteristically short handle was due to a mistake during its manufacture.

    From

    https://en.m.wikipedia.org/wiki/Mjölnir
     
  7. Feb 12, 2020 #97

    John Kemker

    John Kemker

    John Kemker

    Forum Supporter TRF Supporter

    Joined:
    Aug 25, 2019
    Messages:
    404
    Likes Received:
    155
    Gender:
    Male


    Fly it on White Lightning reloads. [grin]
     
    Greg Furtman likes this.
  8. Feb 12, 2020 #98

    jqavins

    jqavins

    jqavins

    Joseph Avins TRF Supporter

    Joined:
    Sep 29, 2011
    Messages:
    2,646
    Likes Received:
    573
    Gender:
    Male
    Location:
    Howard, NY
    David Mallet
     
  9. Feb 12, 2020 #99

    Greg Furtman

    Greg Furtman

    Greg Furtman

    Forum Supporter TRF Supporter

    Joined:
    Nov 10, 2018
    Messages:
    477
    Likes Received:
    179
    Gender:
    Male
    Location:
    Webster, Wisconsin
    I'll have to watch that movie again. ;)
     
  10. Feb 12, 2020 #100

    kuririn

    kuririn

    kuririn

    BARGeezer TRF Supporter

    Joined:
    Oct 3, 2016
    Messages:
    3,129
    Likes Received:
    910
    Gender:
    Male
    Location:
    Hawaii
    When I was a kid Marvel Comics referred to it as the Uru Hammer.
    Probably cuz kids couldn't pronounce Mjolnir.:D
     
  11. Feb 12, 2020 #101

    neil_w

    neil_w

    neil_w

    Pencil Pusher TRF Supporter

    Joined:
    Jul 14, 2015
    Messages:
    7,308
    Likes Received:
    1,344
    Location:
    Northern NJ
    Heck, *I* can't pronounce Mjölnir.
     
    Greg Furtman likes this.
  12. Feb 12, 2020 #102

    boatgeek

    boatgeek

    boatgeek

    Well-Known Member

    Joined:
    Dec 27, 2014
    Messages:
    2,058
    Likes Received:
    559
    I've been super-happy with the customer service at BuyRocketMotors.com. If they carried CTI, I wouldn't buy motors anywhere else.
     
    lakeroadster likes this.
  13. Feb 12, 2020 #103

    Greg Furtman

    Greg Furtman

    Greg Furtman

    Forum Supporter TRF Supporter

    Joined:
    Nov 10, 2018
    Messages:
    477
    Likes Received:
    179
    Gender:
    Male
    Location:
    Webster, Wisconsin
    :rolleyes:
     
  14. Feb 12, 2020 #104

    BABAR

    BABAR

    BABAR

    Builds Rockets for NASA TRF Lifetime Supporter TRF Supporter

    Joined:
    Aug 27, 2011
    Messages:
    4,780
    Likes Received:
    640
    I refuse to waste a neuron learning how to pronounce that word!
     
  15. Feb 12, 2020 #105

    boatgeek

    boatgeek

    boatgeek

    Well-Known Member

    Joined:
    Dec 27, 2014
    Messages:
    2,058
    Likes Received:
    559
    I apparently know too many Scandihoovians because this pronunciation video sounds just like it's written. :)
     
    Greg Furtman likes this.
  16. Feb 12, 2020 #106

    jqavins

    jqavins

    jqavins

    Joseph Avins TRF Supporter

    Joined:
    Sep 29, 2011
    Messages:
    2,646
    Likes Received:
    573
    Gender:
    Male
    Location:
    Howard, NY
    Is that Scandinavian Doctor Who fans?
     
    Greg Furtman and neil_w like this.
  17. Feb 13, 2020 #107

    Nytrunner

    Nytrunner

    Nytrunner

    Master of Rivets

    Joined:
    Oct 15, 2016
    Messages:
    5,640
    Likes Received:
    1,369
    Gender:
    Male
    Location:
    Huntsville AL
    Easy: Mule-ner
     
  18. Feb 13, 2020 #108

    boatgeek

    boatgeek

    boatgeek

    Well-Known Member

    Joined:
    Dec 27, 2014
    Messages:
    2,058
    Likes Received:
    559
    I was pretty sure Scandihoovian predated the Doctor, but had to look it up to be sure. It's from the late 1800's and was originally derogatory. It's now largely used by Scandinavians (actually, more likely multi-generational Scandinavian-Americans) in a good-natured and self-referential way.
     
    Greg Furtman likes this.
  19. Feb 13, 2020 #109

    lakeroadster

    lakeroadster

    lakeroadster

    Lone Wolf... No Club TRF Supporter

    Joined:
    Mar 3, 2018
    Messages:
    1,500
    Likes Received:
    405
    Gender:
    Male
    Location:
    Central Colorado
  20. Feb 14, 2020 #110

    lakeroadster

    lakeroadster

    lakeroadster

    Lone Wolf... No Club TRF Supporter

    Joined:
    Mar 3, 2018
    Messages:
    1,500
    Likes Received:
    405
    Gender:
    Male
    Location:
    Central Colorado
    Last edited: Feb 14, 2020
  21. Feb 14, 2020 #111

    lakeroadster

    lakeroadster

    lakeroadster

    Lone Wolf... No Club TRF Supporter

    Joined:
    Mar 3, 2018
    Messages:
    1,500
    Likes Received:
    405
    Gender:
    Male
    Location:
    Central Colorado
    Motor Mount

    Finished up the motor mount today. Turned down the diy centering rings on the wood lathe, and drilled the hole for the kevlar recovery strap.

    Let the obnoxiously large glue filletting begin!

    001.JPG 002.JPG 003.JPG 004.JPG
    005.JPG
     
    mbeels likes this.
  22. Feb 15, 2020 at 8:21 PM #112

    lakeroadster

    lakeroadster

    lakeroadster

    Lone Wolf... No Club TRF Supporter

    Joined:
    Mar 3, 2018
    Messages:
    1,500
    Likes Received:
    405
    Gender:
    Male
    Location:
    Central Colorado
    Started gluing the fins to the body. This is the first rocket that I have used through the body tube fin tabs to locate all the fins... they sure do make installing the fins easier.

    I had some help from some Native American artifacts in holding everything in place. Getting by with a little help from some old friends.

    000.JPG 001.JPG 002.JPG 003.JPG
    005.JPG
     
    Last edited: Feb 16, 2020 at 1:24 AM
    Greg Furtman, mbeels and SeanW78 like this.
  23. Feb 18, 2020 at 8:33 PM #113

    lakeroadster

    lakeroadster

    lakeroadster

    Lone Wolf... No Club TRF Supporter

    Joined:
    Mar 3, 2018
    Messages:
    1,500
    Likes Received:
    405
    Gender:
    Male
    Location:
    Central Colorado
    I knew the Hammerhead needed quite a bit of weight in the nose. I went back and fine tuned the Open Rocket simulation to reflect the as built fuselage and nose cone and the nose cone weight increased.

    I bored out the nose cone C/L to 11/16" i.d. x 3-5/8" deep, and then cross drilled the head at the "eyeballs" using a 5/16" dia. drill bit.

    I'll use lead in the nose cone and some pan head screws for the eyeballs... "A little Led for the head"

    With the extra weight I'm now planning to use (2) 12" chutes for the head, (2) 12" chutes for the body and a 29 mm F20-W4 motor for the 1st launch... apogee at 705 ft.

    2020-02-18 Open Rocket Simulation.jpg 000.JPG 002.JPG
     
    mbeels likes this.
  24. Feb 18, 2020 at 8:47 PM #114

    BABAR

    BABAR

    BABAR

    Builds Rockets for NASA TRF Lifetime Supporter TRF Supporter

    Joined:
    Aug 27, 2011
    Messages:
    4,780
    Likes Received:
    640
    I always like it when one structural part can serve two completely different purposes.

    Your shark eyes actually are cosmetically pretty cool just by themselves (so nice and shiny I am thinking you just reattach them after painting the rest of the rocket, let ‘em shine!) as well as contributing to the forward mass/CG shift.
     
    SeanW78 and lakeroadster like this.
  25. Feb 18, 2020 at 8:50 PM #115

    lakeroadster

    lakeroadster

    lakeroadster

    Lone Wolf... No Club TRF Supporter

    Joined:
    Mar 3, 2018
    Messages:
    1,500
    Likes Received:
    405
    Gender:
    Male
    Location:
    Central Colorado
    Thanks. That's the ole form follows function thingy.

    I was racking my brain trying to figure out how to add weight near the nose... and then it came to me.. in my mind's EYE. o_O

    002.JPG Hammerhead Eye.jpg
     
    Last edited: Feb 18, 2020 at 8:56 PM
  26. Feb 19, 2020 at 12:11 AM #116

    Daddyisabar

    Daddyisabar

    Daddyisabar

    Well-Known Member

    Joined:
    Jan 23, 2009
    Messages:
    4,390
    Likes Received:
    103
    Gender:
    Male
    Location:
    Littleton Colorado
    Watch out you don't get a Splinter of the Mind"s Eye!
     
    lakeroadster likes this.
  27. Feb 19, 2020 at 3:19 AM #117

    lakeroadster

    lakeroadster

    lakeroadster

    Lone Wolf... No Club TRF Supporter

    Joined:
    Mar 3, 2018
    Messages:
    1,500
    Likes Received:
    405
    Gender:
    Male
    Location:
    Central Colorado
    Got tweezers.... no worries. A hobby knife works great too.
     

Share This Page

Group Builder